package loop;

import java.util.Scanner;

public class judge_0 {
    public static void main(String[] args) {
        int month;
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入您要进行判断的月份：");
        month = scanner.nextInt();
        switch (month){
            case 1: case 3: case 5: case 7: case 8: case 10: case 12:System.out.println("31天");break;
            case 2:System.out.println("28天");break;
            case 4: case 6: case 9: case 11: System.out.println("30天");break;
            default:
                System.out.println("非法参数！");
        }
    }
}
